Make SplitStringUsingSubstr have consistent args.

chrome/browser/media/webrtc/webrtc_log_uploader_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/media/webrtc/webrtc_log_uploader.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 131 matching lines @@
     std::vector<std::string> lines = GetLinesFromListFile();
     EXPECT_GT(lines.size(), 0u);
     if (lines.empty())
       return std::string();
     return lines[lines.size() - 1];
   }
 
   void VerifyRtpDumpInMultipart(const std::string& post_data,
                                 const std::string& dump_name,
                                 const std::string& dump_content) {
-    std::vector<std::string> lines;
-    base::SplitStringUsingSubstr(post_data, "\r\n", &lines);
+    std::vector<std::string> lines = base::SplitStringUsingSubstr(
+        post_data, "\r\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
 
     std::string name_line = "Content-Disposition: form-data; name=\"";
     name_line.append(dump_name);
     name_line.append("\"");
     name_line.append("; filename=\"");
     name_line.append(dump_name);
     name_line.append(".gz\"");
 
     size_t i = 0;
     for (; i < lines.size(); ++i) {
@@ skipping 125 matching lines @@
   log->SetComplete();
   webrtc_log_uploader->LoggingStoppedDoUpload(
       std::move(log), base::MakeUnique<MetaDataMap>(), upload_done_data);
 
   VerifyRtpDumpInMultipart(post_data, "rtpdump_recv", incoming_dump_content);
   VerifyRtpDumpInMultipart(post_data, "rtpdump_send", outgoing_dump_content);
 
   webrtc_log_uploader->StartShutdown();
   FlushIOThread();
 }